#include <iostream>

using namespace std;

#include "a.h"
#include "b.h"
#include "c.h"

int main ()
{
    int n;
    double x;
   
    cout<<"1,sin(x)\n2. cos(x)\n2. sqrt(x)\n input select(1-3):";
    cin>>n;
    cout<<"input x"<<endl;
    cin>>x;

    switch (n)
    {
        case 1: cout<<"sin="<<fsin(x)<<endl;  break; 
        case 2: cout<<"cos="<<fcos(x)<<endl;  break;
        case 3: cout<<"sqrt="<<fsqrt(x)<<endl; break;
    }

    cin>>n;
    return 0;

}



